Superstructure Analyses on Single Crystals of Li0.8VO2
Superstructure Analyses on Single Crystals of Li0.8VO2
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Li0.8VO2单晶的超结构分析
DOI：
10.1006/jssc.1995.1026
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发表时间：
1995
影响因子：
5.4
通讯作者：
H. Takei
中科院分区：
文献类型：
--
作者：
Katsuhiro Imai;H. Sawa;M. Koike;M. Hasegawa;H. Takei
用EXAFS和X射线衍射法对熔剂生长的有序岩盐型Li1-xVO2(x≈0.2)单晶进行了分析，该晶体在室温下沿c轴和ab面上形成了重要的超结构。结果表明，二维取向的V离子在ab面上形成了一个三角形的V3三聚体团簇，其位移为0.160 A，沿c轴的超结构是由于V3三聚体沿c轴的堆积顺序所致。根据周期强度分布函数分析了X射线进动照片中超结构图案的强度，最常见的衍射纹是由簇状V层的外消旋堆积序列引起的。
Abstract Flux-grown single crystals of ordered rock-salt-type Li 1- x VO 2 ( x ≈ 0.2), which form a significant superstructure in the ab -plane and along the c -axis at room temperature, have been analyzed by EXAFS and X-ray diffraction methods. The results show that two-dimensionally oriented V ions in the ab -plane form a cluster of triangular V 3 trimers with a displacement of 0.160 A from the unclustered position and that the superstructure along the c -axis is due to a stacking order of the V 3 trimers along the c -axis. The intensities of the superstructure patterns in X-ray precession photographs are analyzed in terms of the periodic intensity distribution (PID) function, and the most common diffraction streak is caused by a racemate-like stacking sequence of the clustered V layers.